Disclaimer: Trading carries a high level of risk, and may not be suitable for all investors. Before deciding to invest you should carefully consider your investment objectives, level of experience, and risk appetite. The possibility exists that you could sustain a loss of some or all of your initial investment and therefore you should not invest money that you cannot afford to lose. You should be aware of all the risks associated with foreign exchange trading, and seek advice from an independent financial advisor if you have any doubts.
The natural inclination for crypto investors is to identify a new altcoin with the potential for growth, invest heavily when it's still inexpensive to do so, and then reap the rewards when the value increases. That being said, the altcoin market is growing so quickly that many new digital currencies hitting the market might not be good long-term investments.
Identifying sell levels to take profit: Using the order book we identify the areas of resistance that we previously analyzed. It is likely that being resistant, massive supply (a “wall” of sell commands) is present around these spots. The trick is to place our sell commands precisely one step ahead, at a slightly lower price, so in case the demands start to eat away the supply wall – our command has already been placed and sold to profit.
The other major risk to be aware of is that hackers are always looking for vulnerabilities to exploit. One example is the more than $30 million worth of Tether coins that were stolen. The most surefire way to ensure the safety of your coins is by using a hardware wallet such as these by Ledger. Keep in mind that this will slow down your ability to trade those coins, as you will be transferring them between the device and your exchange accounts (more on wallets and exchanges soon).

We are still seeing the bulls grind EMA 4 hour support, but they have to break the lower highs to see continuation and shift momentum. The bears continue to hold the upper paw as long as the lower highs remain. The daily chart continues to tighten and this weekend it will be worth watching other alt coins in daily equilibriums to see if we have any initial ...
There are so many hoops to jump through to set up for mining and each coin has its quirks. The power of your machine and graphix card and your power consumption are all important. My friend mined for 8month Eth and only made couple of hundred bucks by time you subtract power useage etc. He already had a powerful machine used in film industry for video graphix just sitting around so he thought he’d put it to use over that time for a laugh and see what happened. It took many hours messing around to set up and occassionally nursing it over that period. Of course he had to use his machine also occassionally which compromised the performance.
The truth is that bitcoin is the hottest trading market right now, hotter than stock trading, oil trading, gold trading and any other market at this point. The reason people believe this is going to continue to be a hot market is because blockchain technology which is what allows transactions to happen without a central exchange. Here is another strategy on how to draw trend lines with fractals.

Know what you are investing in, and know the risk. Bitcoin is speculative and volatile. Buying near $Xk means buying near the highest price Bitcoin has ever been. Some think Bitcoin is going to $X2k; some think it is going to $10. It is easy to get euphoric and think whatever today’s price is a safe bet. Historically that has been true or not depending on the weather on a given day.

EDIT: #10 Bonus (Suggested by @kerstenwirth ) — always check the ticker symbol. Ticker symbols are not universal, and may vary from exchange to exchange in rare cases. Those cases, though, can come back to bite you. For example, Bitcoin Cash trades on some exchanges as BCH, while it trades on others as BCC. BCC is also the ticker symbol for BitConnect, which was recently outted as a Ponzi Scheme. If you bought BCC under the impression was Bitcoin Cash, you would’ve lost a lot of money.
Never put all your eggs in one basket. Diversify. While the potential to earn more is increased with the amount of money you invest into a coin, the potential to lose more is also magnified. Another way to think about it is to look at the cryptocurrency market as a whole; if you believe that this is just the beginning, then more than likely the entire market cap of cryptocurrencies will increase. What are the chances that this market cap increase will be entirely driven by one coin vs. being driven by many coins? The best way to safely capture the overall growth of cryptocurrency is to diversify and reap the benefits of growth from multiple coins. Also, fun fact — Between January 2016 and January 2018, Corgicoin has increased by 60,000x, and Verge has increased by 13,000x. During the same period, Bitcoin has increased by 34x. While you would have gotten impressive gains from Bitcoin, expanding into other coins could have landed you potentially larger ones.